<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <button>0</button>
    <button>1</button>
    <button>2</button>
    <button>3</button>
    <button>4</button>
</body>
<script src="./index.js"></script>
</html>